I built a mailbox mod for my MES40 and am using the AMNPS with various woods, but always use oak for a base. I nuke in microwave for 90 seconds. I use a propane torch to light it for 30 seconds, then let it burn for 10 or so minutes. It seems like I only get smoke going for 30 minutes or so then it dies. I have drilled a 1inch hole in front of the mailbox for airflow and can adjust how much air its getting. I just can't seem to keep it lit... Any advice? (sorry, no pics of unit at this time, will attache to another post when I can take one) thanks in advance.